]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
hfsplus: prevent btree data loss on ENOSPC
authorErnesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Tue, 30 Oct 2018 22:06:14 +0000 (15:06 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 31 Oct 2018 15:54:13 +0000 (08:54 -0700)
commitd92915c35bfaf763d78bf1d5ac7f183420e3bd99
tree6c55bdd6cdbff28215f7a4df2c61ed31716ca09a
parentef75bcc5763d130451a99825f247d301088b790b
hfsplus: prevent btree data loss on ENOSPC

Inserting or deleting a record in a btree may require splitting several of
its nodes.  If we hit ENOSPC halfway through, the new nodes will be left
orphaned and their records will be lost.  This could mean lost inodes,
extents or xattrs.

Henceforth, check the available disk space before making any changes.
This still leaves the potential problem of corruption on ENOMEM.

The patch can be tested with xfstests generic/027.

Link: http://lkml.kernel.org/r/4596eef22fbda137b4ffa0272d92f0da15364421.1536269129.git.ernesto.mnd.fernandez@gmail.com
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/hfsplus/attributes.c
fs/hfsplus/btree.c
fs/hfsplus/catalog.c
fs/hfsplus/extents.c
fs/hfsplus/hfsplus_fs.h